Publications


Title : Dynamical Blebbing at a Droplet Interface Driven by Instability in Elastic Stress: A Novel Self-motile System

Language: English
Type: Article
Authors: Yutaka Sumino, Hiroyuki Kitahata, Hideki Seto and Kenichi Yoshikawa
Journal: Soft Matter
Volume: 7
Number: 7
Month: 4
Year: 2011
Actual year: 2011
Pages: 3204-3212
URL:   http://pubs.rsc.org/en/Content/ArticleLanding/2011/SM/c0sm00906g
doi:   10.1039/C0SM00906G
Abstract: Dynamical blebbing in an oil–water system is reported together with a quantitative analysis of interfacial deformation. An oil droplet containing a fatty acid that floats on an aqueous phase containing a cationic surfactant shows blebbing-type deformation at the oil–water interface. Such deformation is caused by an out-of-equilibrium concentration distribution across the interface. The generation and breakage of aggregates at the interface is associated with the time-dependent instability of the interface that accompanies the blebbing. In a quantitative analysis, the size of the bleb depended on the size of the oil droplet: the size of the bleb was inversely proportional to the square root of the radius of the oil droplet approximately. Furthermore, the experimental results showed that an oil droplet undergoes translational motion, i.e., active Brownian motion, under a suitable size of the oil droplet. A simple mathematical model based on the elasticity of the aggregates is proposed, and this agrees well with the experimental results.

"Dynamical Blebbing at a Droplet Interface Driven by Instability in Elastic Stress: A Novel Self-motile System"

Yutaka Sumino, Hiroyuki Kitahata, Hideki Seto and Kenichi Yoshikawa, Soft Matter, 7, 3204-3212, (2011)